Adrenomedullin predicts high risk and culture positivity in children with solid tumors suffering from neutropenic fever.

AIM OF STUDY: Neutropenic fever is a source of morbidity and mortality in children with cancer. It is not possible to detect the causative agent in cultures in most cases; the research for a marker that can show the severity of the disease is ongoing. We evaluated the role of adrenomedullin (ADM) at predicting prognosis on patients with febrile neutropenia, which has been proven to be a good prognostic marker for diseases with high morbidity and mortality, such as heart failure, ischemic ventricular dysfunction, sepsis, and systemic inflammatory response syndrome. MATERIALS AND METHODS: We recorded the 36 febrile episodes of 14 children receiving chemotherapy due to solid tumors. There were 10 events with unknown origin in the low-risk group, while in the high-risk group, there were 17 events with unknown origin, 8 events with microbiological origin and 1 event with clinically proven infection. Cultures were positive only in the high-risk group. However, the changes of ADM levels through time periods (first, second, third, and seventh days) were not significant. RESULTS: The first-day plasma ADM levels significantly predicted the presence of culture positivity (AUC 0.628, 95% CI 0.40-0.85, p = 0.303) and high-risk patients with neutropenic fever (AUC 0.76, 95% CI 0.56-0.97, p = 0.016). CONCLUSION: Our study showed that increased plasma ADM was correlated with high-risk neutropenic fever and culture positivity. The ADM levels in the high-risk group were clearly high at the diagnosis and continued to the end of the treatment.

Anticardiolipin Antibodies in Children with Helicobacter pylori Infection.

BACKGROUND: Anticardiolipin (aCL) antibodies are associated with thrombosis and have an important role in the etiology of diseases such as stroke and myocardial infarction whose etiologies were based on thrombosis. H. pylori has been proposed to be responsible for the pathophysiology of some diseases including stroke, myocardial infarction, thrombosis, and autoimmune diseases. From this point of view, we hypothesized a possible relationship between H. pylori infection and aCL antibodies and initially aimed to determine the prevalence of aCL antibody positivity in children with H. pylori infection. MATERIALS AND METHODS: Anticardiolipin antibodies were studied in 84 patients before and after eradication therapy and in a control group including 40 children. RESULTS: The pretreatment aCL IgA (median 12.78 APL/mL), aCL IgM (median 21.60 MPL/mL), and aCL IgG antibody levels (median 14.22 GPL/mL) were significantly higher than those of post-treatment results (median 5.38 APL/mL, 7.02 MPL/mL, and 6.64 GPL/mL, respectively) and controls (median 5.90 APL/mL, 4.80 MPL/mL, and 4.81 GPL/mL, respectively). Anticardiolipin antibodies revealed no significant differences between the study group after therapy and the control group. CONCLUSIONS: In our particular experience, H. pylori can cause aCL antibody positivity in children and eradication of H. pylori provides the disappearance of these antibodies.

The timing of autologous stem cell transplantation and the prognostic factors affecting the prognosis in children with relapsed Hodgkin lymphoma.

Although ASCT is used as a standard treatment following second remission for adults in oncology practice, data are lacking for relapsed childhood HL. Therefore, we evaluated the exact timing of the ASCT treatment, as well as factors affecting the prognosis in children with relapsed HL who underwent ASCT. Patients were divided into two groups (Group 1: ASCT after second remission [n = 6], Group 2: ASCT after >2 remissions [n = 3]). Overall, DFS rate was 64.8% at 24 months after ASCT. In Group 1, post-transplant DFS and OS were 83.3% and 75%, respectively, and the post-transplant response without event rate was 5/6 (83.3%). However, in Group 2 this was 1/3 (33.3%). Nonetheless, the timing of ASCT was not a significant prognostic factor for DFS and OS in univariate analyses (p = 0.21 and p = 0.73, respectively). Median follow-up time was 21 months after transplant, and DFS and OS were 62.5% and 75% in early relapse group (n = 6) at 24 months. DFS and OS were both 66.7% in late relapse (n = 3). In addition, response rates of ASCT without event were 66.7% for both early and late relapse groups. Relapse types (early: 3-12 months, late: >12 months) was not a significant prognostic factor for DFS and OS in univariate analyses (p = 0.96 and p = 0.92). While we found ASCT to be a useful treatment following second remission, it does not demonstrate better success in early relapse cases, when compared to late relapse cases. Therefore, after second remission for relapsed HL, ASCT is advisable regardless of the time of relapse.

Outcome of autologous hematopoietic stem cell transplantation in children and adolescents with relapsed or refractory Hodgkin's lymphoma.

This study evaluates the outcome of 66 pediatric patients with rrHL who underwent autoHSCT. Twenty-nine patients experienced early relapse, and 19 patients experienced late relapse. Of 18 newly diagnosed with HL, 13 were primary refractory disease and five had late responsive disease. At the time of transplantation, only 68% of the patients were chemosensitive. The majority of patients received BCNU + etoposide + ara-C + melphalan for conditioning (45/66), and peripheral blood (56/66) was used as a source of stem cells. After a median follow-up period of 39 months, 46 patients were alive. At five yr, the probabilities of OS, EFS, the relapse rate, and the non-relapse mortality rate were 63.1%, 54.3%, 36.4%, and 9.1%, respectively. The probability of EFS in chemosensitive and chemoresistant patients at five yr was 72.3% and 19%, respectively (p < 0.001). Multivariate analysis showed that chemoresistant disease at the time of transplantation was the only factor predicting limited both OS (hazard ratio = 4.073) and EFS (hazard ratio = 4.599). AutoHSCT plays an important role for the treatment of rrHL in children and adolescents, and survival rates are better for patients with chemosensitive disease at the time of transplantation.

Prevalence and risk factors of tinea capitis and tinea pedis in school children in Turkey.

OBJECTIVE: To evaluate the prevalence and risk factors of tinea capitis and tinea pedis in school children in Turkey. METHODS: The study included 8122 students from 24 schools in the rural and urban areas around Kayseri,Turkey. We asked every student for their personal identification and also for their sanitation in order to get an idea about dermatophytosis. Samples taken from suspicious lesions were collected and inoculated onto Sabouraud dextrose agar slants. For identification of grown fungi, macroscopic appearance of colonies, microscopic examination and biochemical tests were used. RESULTS: There were 41 (0.5%) suspicious lesions in feet and 31 (0.3%) in scalp and 22 (0.2%) students were diagnosed as tinea pedis and 9 (0.1%) as tinea capitis by fungal culture. The predominant etiologic agents in feet were Trichophyton rubrum 8 (36%), Trichophyton mentagrophytes 1 (4%), Rhodotorula 8 (36%), Trichosporon 2 (9%), Candida glabrata 2 (9%), Candida albicans 1 (4%), while Trichophyton verrucosum 8 (88%) and Trichophyton mentagrophytes 1 (12%) were identified in scalp samples. School settlement was found as risk factors on the frequency of tinea pedis and capitis. Age and gender were also found as risk factors on the frequency of tinea pedis. CONCLUSION: The results of this study demonstrate a low prevalence of tinea capitis and tinea pedis in school children of central Anatolia of Turkey. School settlement is a very important factor affecting the prevalence of tinea capitis and pedis in school children in central Anatolia of Turkey.

Pulmonary tuberculosis mimicking metastasis in a patient with osteosarcoma.

Pulmonary metastasis even at diagnosis or during treatment is an important problem in osteosarcoma treatment and treatment modality varies in patients with metastasis. Metastasectomy and aggressive induction chemotherapy are the 2 most well-known treatment options. However, reactivation of pulmonary tuberculosis can be a problem in developing countries, where the prevalence of tuberculosis is high. Here, we described a patient with osteosarcoma with pulmonary tuberculosis reactivation mimicking metastasis.

Melatonin ameliorates doxorubicin-induced skin necrosis in rats.

Doxorubicin (DXR), a highly effective chemotherapeutic agent, causes serious injury when extravasated. The injury can sometimes result in skin necrosis and ulceration, requiring surgery. The detrimental effect of DXR on the antioxidant system via free oxygen radicals is one of the mechanisms proposed in its etiology. Thus, we used melatonin, a potent antioxidant, and compared the effects with dimethylsulfoxide (DMSO), which is used in the treatment of patients with DXR-induced extravasation.Twenty-seven Wistar-albino rats were used. After intradermal injection of DXR, DMSO was injected into the extravasated area and melatonin was given intraperitoneally. On day 14 of the experiment, skin ulcers were clearly formed and samples were taken with a punch biopsy. Ulcer sizes were measured. Tissue samples were analyzed for superoxide dismutase, glutathione peroxidase, and malondialdehyde enzymes, and histopathologically evaluated.Melatonin clearly decreased MDA levels, ulcer size, and histopathologic ulcer scores in DXR extravasated tissue. DMSO also decreased MDA levels, ulcer size and histopathologic ulcer score. However, melatonin was remarkably more effective than DMSO in terms of antioxidant enzyme activity, oxidative stress, and histopathologic ulcer scores in rats. Necrosis was evident in the DXR-treated group and some slides showed necrosis involving the fascia. Histopathologic ulcer scores of the necrotic tissue decreased in the DMSO and melatonin groups. The ulcer score in the melatonin group was significantly lower than in the control group. Although the ulcer score in the DMSO group was lower than control, there was no statistically significant difference. The ulcer size in the DMSO group was significantly lower than the control group. The ulcer size in the melatonin group was significantly lower than both the DMSO and control groups.We believe that melatonin, either alone or in combination with DMSO, may be used for treating DXR extravasation. In addition, free oxygen radicals play a crucial role in the etiology of the injury, which should be considered in further studies.

Primary gastric Burkitt lymphoma: a rare cause of intraabdominal mass in childhood.

Primary gastric lymphoma in the pediatric population is rare and the role of Helicobacter Pylori (H. Pylori) in its pathogenesis is unclear. In this report, we describe a case of non-Hodgkin's lymphoma (Burkitt's type) coexisting with H. pylori and discuss the potential relationship between H. Pylori and gastric Burkitt lymphoma.

Primary cutaneous anaplastic large cell lymphoma.

Anaplastic large cell lymphoma (ALCL) is characterized by proliferation of anaplastic large CD 30+ T-cell lymphoid cells with abundant cytoplasm. Primary cutaneous ALCL is a rare form of ALCL, usually seen in elderly patients. In this report, the authors present an unusual case of 15-year-old boy with a solitary left ear lobe mass, previously reported as keratoacanthoma which was later histopathologically and immunohistochemically diagnosed as T-cell phenotype, anaplastic lymphoma kinase (ALK)-negative primary cutaneous anaplastic large cell lymphoma. The patient's response to chemotherapy was good and he is receiving the continuation phases of his chemotherapy.

A rare type of renal cell carcinoma in a girl: hybrid renal cell carcinoma.

Hybrid renal cell carcinoma (HRCN) is a rare type of renal tumor with characteristic pathologic features, including oncocytic and chromophobe cellular content, and shows more favorable prognosis than renal cell carcinoma. The early-stage tumors show favorable outcome, and postoperative regular clinical and radiological follow-up is adequate in most cases. However, close follow-up is mandatory for tumors with histopathologically coexistence of squamous, papillary, and/or eosinophilic RCC component. This report describes a 12-year-old girl with a stage I HRCN who was closely followed after nephrectomy with no further treatment.

Alpha-fetoprotein producing tumor cells in children with Wilms' tumor.

Alpha fetoprotein (AFP) is generally used as a marker in diagnosis and follow-up of germ cell tumors and hepatoblastomas. However, serum AFP levels were elevated in our three patients with Wilms tumor. The elevated levels could only be decreased completely by surgery and not by chemotherapy. Histopathologically, the tumors consisted of blastemal, stromal, and epithelial cells. Chemotherapy was only effective on stromal and epithelial components of the tumors. In AFP staining, the source of AFP production was identified as blastemal tumor cells. Because the increased AFP levels were decreased after surgery, AFP levels may be used in the follow-up of the patients with Wilms tumor. Herein, we report three patients with Wilms tumor whose serum AFP levels were elevated and who had diffuse WT-1 and focal AFP expression in all tumors, immunohistochemically.

Evaluation of effects of s-methyl isothiourea and melatonin on intestinal ischemia/reperfusion injury in rats.

The present study was designed to evaluate whether the administration of s-methylisothiourea and melatonin has protective potential in intestinal ischemia/reperfusion injury. Forty male Sprague-Dawley rats were divided into five groups. Ileal specimens were obtained to determine the levels of malondialdehyde, protein carbonyl content, levels of antioxidant enzymes and evaluation of histologic changes. Combination of s-methylisothiourea and melatonin, led to a statistically significant increase in activities of antioxidant enzymes with a decrease in malondialdehyde and protein carbonyl content and intestinal mucosal injury scores. It was shown; combination of SMT and melatonin may exert more promised results.

Melatonin and 1400 W ameliorate both intestinal and remote organ injury following mesenteric ischemia/reperfusion.

OBJECTIVE: Acute intestinal ischemia reperfusion (I/R) injury affects not only the intestines but also remote organs due to pro-inflammatory and tissue injurious factors. Thus, we aimed to investigate the roles of melatonin (a powerful antioxidant) and 1400W (a strong inhibitor of inducible nitric oxide) in a rat intestinal I/R injury model, since oxidative and nitrosative injury are believed to be the major causes. METHODS: A total of 56 Wistar albino rats were used, with seven rats in each group. After I/R induction in the intestines by clamping/unclamping the superior mesenteric artery, we measured malondialdehyde, superoxide dismutase, glutathione peroxidase, nitric oxide, and 3-nitrotyrosine levels in lung, kidney, and liver tissues (to evaluate remote organ injury) as well as in the intestines. Study groups received melatonin, 1400W or both to examine the roles of these molecules in the pathogenesis of injury following I/R. RESULTS: Melatonin and 1400W had an ameliorating effect on both oxidative and nitrosative stress in the intestine and the lung against mesenteric I/R injury in rats. Moreover, each of these two agents had an inhibitory effect on oxidative injury and histopathological changes in the intestine and the lung. Furthermore, the combination of both agents (melatonin and 1400W) was more effective than either of the agents alone (P < 0.05). CONCLUSION: Melatonin and 1400W, either alone or in combination, were efficient in ameliorating experimental I/R injury of the intestines.

Erdosteine and ebselen as useful agents in intestinal ischemia/reperfusion injury.

BACKGROUND: Reactive oxygen and nitrogen species generated during reperfusion of the tissue are characteristic of ischemia/reperfusion (I/R) injury. The purpose of the present study was to investigate whether erdosteine and ebselen, molecules with antioxidant properties and peroxynitrite scavenging capability, respectively, can reduce oxidative stress and histological damage in the rat small bowel subjected to mesenteric I/R injury. MATERIALS AND METHODS: Forty Sprague-Dawley rats were divided into five groups equally: sham, I/R, I/R plus erdosteine, I/R plus ebselen, and I/R plus erdosteine and ebselen. Intestinal ischemia for 45 min and reperfusion for 3 d were carried out. Ileal specimens were obtained to determine the tissue levels of malondialdehide (MDA), protein carbonyl content (PCC), superoxide dismutase (SOD), glutathione peroxidase (GPx), nitrite/nitrate (NO(x)) level and histological changes. RESULTS: Intestinal I/R resulted in increased tissue MDA, PCC, and NO(x) levels and decreased SOD and GPx activities. Both erdosteine and ebselen alone significantly decreased MDA, PCC, and NO(x) levels and increased antioxidant enzymes activities, but all values were different from control. These changes almost returned to control values in the group treated with erdostein and ebselen. Histopathologically, the intestinal injury in rats treated with erdosteine and ebselen as well as combination were less than I/R group. CONCLUSIONS: Both erdosteine and ebselen were able to attenuate I/R injury of the intestine via inhibition of lipid peroxidation and protein oxidation, maintenance of antioxidant, and free radical scavenger properties. Nevertheless, combination treatment showed more promising results, suggesting that scavenging peroxynitrite nearby antioxidant activity is important in preventing intestinal I/R injury.

Hematopoietic stem cell transplantation in Langerhans cell histiocytosis: case report and review of the literature.

The prognosis in children with LCH who do not respond to the conventional therapies is very poor. SCT may be a new approach. However, there are limited data about the results of the transplantations. Herein we report a patient with refractory multisystem LCH who underwent allogeneic bone marrow transplantation and is disease and treatment free 54 months after transplantation. Further studies are required to establish the role of SCT in refractory LCH.

Enteral glutamine and/or arginine supplementation have favorable effects on oxidative stress parameters in neonatal rat intestine.

OBJECTIVE: To investigate and compare the effects of enteral glutamine and arginine supply on lipid peroxidation and antioxidant enzyme levels in the small intestine of healthy breast-fed rats. MATERIALS AND METHODS: The study comprised 40 newborn Sprague-Dawley rats born to 5 mother rats. Newborn rats were randomly divided into 4 groups. Starting from day 1 until day 21, group I received only breast milk; group II received breast milk and 200 mg/kg/day oral glutamine; group III received breast milk and 200 mg/kg/day oral arginine; and group IV received breast milk, 200 mg/kg/day glutamine, and 200 mg/kg/day arginine. Malondialdehyde levels and glutathione peroxidase (GPx) and superoxide dismutase activities were measured. RESULTS: The lowest malondialdehyde levels were found in group II (P = 0.0001). Superoxide dismutase activity was found to be significantly higher in group II than group I (P < 0.001). Of the 4 groups, GPx activity was highest in group IV. GPx activity in group II was significantly higher than in group I (P = 0.001) or group III (P = 0.001). GPx activity was higher in group IV than in group I (P = 0.001) or group III (P = 0.001). CONCLUSIONS: Enteral glutamine alone or in the presence of arginine has favorable effects on oxidative stress not only in experimental models of hypoxia-reoxygenation, but also in healthy newborn rats. This suggests that in premature neonates with insufficient oxidative resistance, glutamine and arginine supplementation may help prevent necrotizing enterocolitis.

Cardioprotective roles of aged garlic extract, grape seed proanthocyanidin, and hazelnut on doxorubicin-induced cardiotoxicity.

Doxorubicin (DXR) is a chemotherapeutic agent used effectively in the treatment of several childhood malignancies. During treatment, cardiotoxicity caused by cell damage due to the free oxygen radicals that are generated is a major limiting factor. This study was undertaken to determine whether DXR-induced cardiotoxicity could be prevented by natural foods with antioxidant properties such as aged garlic extract (AGEX), grape seed proanthocyanidin (PA), and hazelnut. Wistar albino male rats were assigned randomly to 9 groups each consisting of 15 rats. AGEX, PA, and hazelnut groups received these antioxidants in addition to their standard rat diet. They were also treated with cumulative intraperitoneal (i.p.) injections according to 2 different regimens: either a high-dose of 15 mg/kg DXR (3.75 mg/kg per week for 4 weeks) or a low-dose of 7.5 mg/kg DXR (1.875 mg/kg per week for 4 weeks). The control group received i.p. 0.9% saline. AGEX, PA, or hazelnut supplements were given orally to the groups for a 6-week period starting 1 week before the DXR treatment and ending 1 week after the treatment. One week after the last DXR injection, heart tissue samples were analyzed to determine malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT), and xanthine oxidase (XO) levels, and serum samples were taken for creatine kinase (CK). There were no significant changes in MDA levels among the control, DXR-treated groups, or supplemented groups that received additional natural antioxidant foods. SOD enzyme levels were decreased in rats treated with DXR. PA prevented the decrease at low doses of DXR. DXR treatment decreased CAT enzyme levels, but additional PA and hazelnut consumption increased these levels at low cumulative doses. XO enzyme levels were decreased in AGEX and hazelnut groups, but PA prevented the decrease. CK levels were elevated after DXR administration, indicating myocardial injury, but PA significantly reversed this. Although there were no differences histopathologically between AGEX, PA, and hazelnut groups, the protective effects of AGEX and PA were evident in electron microscopy. In conclusion, the positive effects of natural antioxidant foods on the prevention of DXR-induced cardiac injury could not be clearly shown on the basis of antioxidant enzymes. However, the electron microscopic changes clearly demonstrated the protective effects of AGEX and PA. The supplementation of these antioxidant foods over longer periods may show more definitive results. Human studies with different doses are needed to evaluate the effects of these foods on the human heart.

Hepatoblastoma metastatic to the right atrium responding to chemotherapy alone.

An 18-month-old boy presented with abdominal pain and distension. On physical examination there was a 10 x 7-cm mass in the right upper abdominal quadrant. His alpha-fetoprotein level was 175,000 IU/mL. Abdominal magnetic resonance findings revealed hepatomegaly with multiple tumor masses involving nearly all the segments of the liver (PRETEXT IV). The tumor extended through the inferior vena cava and filled 2/3 of the right atrium. Echocardiography revealed normal cardiac function. Histopathologic findings after liver biopsy were consistent with hepatoblastoma. After 6 courses of chemotherapy including cisplatin and doxorubicin (PLADO, SIOPEL protocol), the cardiac tumor regressed completely. The patient's primary tumor was then fully resected; no cardiac surgery was performed. After surgery the AFP level was 4 IU/mL and echocardiography revealed normal cardiac function with no residual tumor. The patient has been in remission for 31 months postdiagnosis.

Effects of aminoguanidine and melatonin on intestinal ischemia/reperfusion injury in rats: An assessor-blinded, controlled experimental study.

BACKGROUND: The reactive oxygen and nitrogen species generated during reperfusion of tissue are characteristic of intestinal ischemia and reperfusion (IIR) injury. OBJECTIVE: This study was designed to assess whether the administration of aminoguanidine (AG), a selective nitric oxide synthase inhibitor, and/or melatonin has protective potential in IIR injury. METHODS: Male Wistar albino rats (age, 3-4 weeks; weight, 100-150 g) were divided in a nonrandom fashion into 5 groups of equal size: group 1, IIR injury + AG 100 mg/kg; group 2, IIR injury + melatonin 10 mg/kg; group 3, IIR injury + AG 100 mg/kg + melatonin 10 mg/kg; group 4, sham operation; and group 5, IIR injury alone. Sixty minutes of intestinal ischemia and 4 hours of reperfusion were carried out in all but the sham-operation group. Ileal specimens were obtained from all rats to determine the extent of histologic changes, measure tissue concentrations of malondialdehyde (MDA) and protein carbonyl (PC), and assess the activity of superoxide dismutase (SOD) and glutathione peroxidase (GPx). Specimens were also assessed and scored by a pathologist blinded to the experiment and the data. RESULTS: Forty rats were divided into 5 groups of 8 each; all 40 survived until study end. In the IIR injury-alone group, mean (SD) MDA concentration and PC content were significantly higher than that of the sham-operation group, and SOD and GPx activity were significantly lower: MDA concentration, 0.86 (0.03) versus 0.54 (0.01) mmol/g protein, respectively; PC content, 0.60 (0.02) versus 0.34 (0.01) mmol/g protein; SOD activity, 104.33 (43.14) versus 2954.72 (109.55) U/g protein; and GPx activity, 10.44 (0.63) versus 24.34 (1.77) U/g protein (all, P < 0.001). Administration of AG, melatonin, and the AG/melatonin combination was associated with significantly higher SOD (1802.31 [102.35], 1776.50 [58.41], and 1924.28 [98.10] U/g protein, respectively) and GPx (17.36 [1.23], 15.96 [1.08], and 18.06 [1.72] U/g protein) activity and significantly lower MDA concentration (0.62 [0.02], 0.64 [0.02], and 0.56 [0.01] mmol/g protein) and PC content (0.53 [0.03], 0.51 [0.01], and 0.49 [0.02] mmol/g protein) compared with the IIR injury-alone group (P < 0.001). Mean intestinal mucosal injury scores were significantly lower in the 3 treatment groups (2.12 [0.35], 1.75 [0.46], and 1.12 [0.35]) compared with the IIR injury-alone group (3.87 [0.35]; all, P < 0.001). CONCLUSION: In this study, AG, melatonin, or both administered in combination were associated with improvements in oxidative markers in this rat model of IIR injury.